Calculating machine



R. L. MULLER yinxncuzma'im: MACHINE May 28,. 1940.

Original Filed Sept. 22, 1934 '7 Sheets-Sheet 1 S Y R E m %m n n v V N e A l/ b MW m9 M W R ms Q\\ Nb Om MIN m x HME May 28, 1940. R. 1.. MULLER CALCULATING MACHINE 7 Sheets-Shet 2 ori inal Filed Sept. 22, 1954 Fig.3.

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INVENTOR m mw IM- ATTORNEYS May 28, 1940- R. L MULLER CALCULATING MACHINE 7 Sheets-Sheet 3 Original Filed Sept. 22, 1934 M l W%m ML m 7 /0 N. l T V mw M N [P0 May 28, 1940. R. 1.. MULLER CALCULATING MACHINE Ori inal Filed Sept. 22, 1934 7 Sheets-Sheet 4 May 28, 1940. MULLER CALCULATING momma Original Filed Sept. 22, 1934 7 Sheets-Sheet 5 W H E 7%m R I E 0/ PM m .6 EW. W W w A P VIM May 28, 1940. a. MULLER CALGULATING MACHINE Original Filed Sept. 22, 1934 7 Sheets-Sheet 7 INVENTOR Faker? L. Mm

BY TZZd/er ATTIOZNEYES 7 Patented May 28,

. UNITED STATES PATENT oFFicE 2,202,596 CALCULATING momma Robert L. Muller, Detroit, Mich., assignor to Burroughs Adding Machine Company, Detroit, Mich., a corporation of Michigan Application September 22, 1934, Serial No. 245,066

Renewed August 7, 1936 Claims.

a large number, of entries may be made, it has a front-feed throat that may be opened and closed to permit work sheets to be inserted in front of the platen, printed upon, removed, and new work sheets inserted, while the record sheet remains in the machine.

In the machine of said copending application provision is made not only for automatically opening the front-feed throat, but also for automatically closing it. The present application includes certain improvements as will hereinafter appear.

The general object of the invention is to provide an improved paper handling equipment for calculating machines and the like.

A more particular object is to provide an improved front-feedpaper equipment for such machines having a. throat that may be automatically closed and opened during a cycle of machine operation.

A still further object is to providean improved front-feed machine in which the throat may be automatically closed and opened during a-single cycle of machine operation and in any columnar position of the carriage at the option of the operator.

Other objects and advantages of the invention will appear from the following specification and drawings.

An embodiment of the invention is shown in the accompanying drawings in which:

Figure 1 is a left side elevation and partial section of a machine with the improved paper handling equipment applied thereto, the parts being in normal or closed-throat position.

Fig. 2 is a partial right side elevation and sec tion of the platen mounting and the front-feed throat, with the parts shown in open-throat" position.

Fig. 3 is a view similar to Fig. 2 with the parts in closed-throat position.

Fig. 4 is a partial rear elevation with some of the parts cut away to show others more clearly.

nism, the parts being shown in normal closedthroat position.

Fig. 6 is a view similar to Fig. 5 but showing the parts in open-throat position.

Fig. 7 is a partial front elevation of another species of throat opening and closing mechanism with the parts in normal closed-throat position.

Fig. 8 is a partial front elevation of still another species of throat opening and closing mechanism, the parts being in normal closed-throat position.

Fig. 9 is a detail view of one studs used with the species of Fig.

of the carriage 7.

lating mechanism.

lit.

Fig. 12 is a partial right side elevation of the machine showing a species of the invention in which the control of the opening and closing of the throat is by a special motor bar on the machine.

Fig. 13 is a partial rear elevation of the automatic mechanism for opening the throat as used with the construction of Fig. 12. The invention is shown applied calculating machine of the type.

to a Burroughs used for bookkeeping, accounting, and statistical work. Since the general features of this machine are well. known, it will be described only very generally.

General features of machine .which its various functions are performed It may be cycled by a hand crank but most of the present-day machines are cycled by a power operated driving means which is actuated by an electric motor 8 acting through a clutch contained in the housing 9. The motor and clutch are normally controlled by a motor bar S which,

when depressed, causes the motor to give the machine a cycle of operation. The motor employed may be of the normally inactive type in which the motor circuit is closed by depression of the motor bar or may be a continuously running motor. When the machine is given a cycle of operation by the motor, a drive shaft is rotated through a single revolution, said shaft being connected by suitable cranks, links and levers,

some of which are shown in dotted lines in Fig. 1, to a main shaft ll of the machine.

An amount indexing means is provided comprising a plurality of depressible amount keys I upon which items may be indexed for entry, into the machine. Suitable calculating mechanism, including a registering mechanism (not shown) is contained in the housing 3. Numerous function-control keys, one of which is the total key 2 (Fig. 1), are provided for controlling the various functions performed,by the machine.

The machine has a printing mechanism for printing the amounts entered in it as well as the totals thereof, a portion of said printing mechanism being shown at Q in Fig. 1. Normally, at an appropriate time during the machine cycle, generally near the end of the first half of the cycle, the printing mechanism is operated to drive the type against record material held about a platen P Provision is made for enabling printing to occur in different columns on record material sup.- ported by said platen. This is accomplished by means of a columnar-printing control means in the form of a traveling paper carriage ii together with means for moving and controlling the movement of said carriage. This carriage, which supports the platen P, is urged across the machine to the left, viewing the machine from the front, by a spring drum l8 and its movement is controlled by a tabulating mechanism that will be described later. Normally, near the end of each machine cycle, the carriage moves from one column to another. This movement may be from one column to a column immediately adjacent or it may beto some other column, the control being variable. The carriage is arrested by tab stops M2 shown in Figs. 1, 10, and 11 whose operation will be later described. These stops are freely adjustable so that the stationary position of the carriage and the width of the columns may be readily changed. When it is desired that the paper carriage remain station'- ary, the tabulating mechanism is normalized or disabled by means of a carriage normal key t (Fig. l) the use and function of which are well known. This carriage normal key may also be made a live key, i. e., its depression may cause the motor to give the mechine a cycle of operation in which event it is called a vertical spacing bar, as also well known.

The carriage may be returned to the right by hand or it may be returned by a motor through mechanism contained in the housing l.

The machine may be conditioned to perform various functions either manually .by the function-control keys above mentioned or automatically under the control of the paper carriage which, in its movement to different positions, conditions the machine for various functions as it well known in the art.

Platen mounting The platen P is not only mounted so that it may rotate for line spacing but also so that it may be moved from its normal printing position adjacent the printing mechanism to an out-of-printing position which may also be called a throwback, or front-feed, position to facilitate the removal and insertion of work sheets as presently will be explained. In the embodiment disclosed the platen may be moved to two difierentthrowback positions, one of which is called a partial or "intermediate-throwback position and the other the full-throwback position.

The platen P (Fig. 2) is fixed to a platen shaft ill that is journaled for rotation in two end plates ll, one of which is shown in Fig. 2, and

both of which are pivoted on a shaft !2 that is supported by the paper carriage end plates IS. The platen is urged to the printing position of Fig. 2 by its own weight and by a spring 14 (Fig. 1).

Associated with the platen are flexible strips l5 adapted to hold a record sheet R around the platen so that said sheet will move with the platen as the latter is moved from printing to front-feed position and vice versa without having its position disturbed. Suitable line-space mechanism is provided for the platen, portion N5 of which are shown in Fig. 1.

The platen is rocked from its printing position of Fig. 3 to its front-feed position of Fig. 2 by rocking the shaft 62 clockwise in Fig. 2. This rocking is accomplished by means of crank arms 20 of which there is one near each end of the shaft 02. One of these arms is shown in Fig. 2 and the other in Fig. 1. The crank'arms 20 carry studs 2i operating in slots 22 of levers 23 pivoted on studs 24 on the end plates 43 of the paper carriage. These slots are curved so that when the parts are in the position of Fig. 2 the platen is latched in printing position due to the fact that the studs 2| are in such position in the slots 22 that any tendency of the platen to move out of printing position is resisted by such studs engaging the rear edges of the slots. The rear ends of the levers 23 are connected by a bail member 25 by means of which the levers are rocked as will be presently described.

When the levers 23 are rocked counterclockwise (Fig. 2), that is, when their rear ends are raised, the crank arms 20 are moved clockwise which results first, in unlatching the platen and, then, as the studs 2i engage the upper curved end of the slots 22, in moving the platen from printing to front-feed position. When the levers 23 are rocked in the opposite direction the platen Front-feed The paper carriage supports a front-feed means for enabling work sheets to be front fed with respect to the platen into a front-feed throat that may be opened and closed. This front-feed means may include portions of the paper equipment other than the main throat elements but, for the present, the description will be directed primarily to the main throat elements.

A front-feed throat is formed by the platen P and a set of feed, or pressure, rolls 3% (Fig. 2) that cooperate with the platen. Provision is made for causing a relative movement between the platen and pressure rolls to open and close the front-feed throat.

The pressure rolls 3d are carried by a shaft 3i journaled in the ends of arms 32 pivoted at 33 on the plates M in which the platen shaft i0 is journaled. The feed rolls are urged into engagement with the platen by springs 34 of which one is shown in Fig. 2, the springs being connected between the arms 32 and the plates 0 i. It should be noted that while the pressure rolls may be moved relative to the platen they move with it as it is moved from printing to front-feed position and vice versa.

The arm. 32 shown in Fig. 2 has an upwardly extending portion 35 carrying a stud 36 that is positioned to engage an abutment nose in on a lever 38 pivoted at to one of the carriage side plates l3. When the front-feed throat is closed the parts occupy the position illustrated in Fig. 3,

The front-feed throat is opened by raising the bail upwardly from its Fig. 3 position. This rocks the levers 23 counterclockwisev and swings the platen from the position 0! Fig. 3 toward that of Fig. 2. As the platen moves upwardly and rearwardly the arms 32 carrying the pressure rolls move bodily with the platen and, as the platen approaches its front-feed position, the stud 36 on arm 35 engages the abutment nose 31. Further movement of the platen toward frontfeed position then causes the arm 35 to be rocked counterclockwise which swings the feed or pressure rolls v30 away from the platen while, at the same time, the platen continues its movement away from the pressure rolls. In this way the front-feed throat is quickly and widely opened as the platen reaches its front-feed position.

The front-feed throat is closed by moving the ball 25, which movement is controlled in a manner to be presently described. If the bail is free' for downward movement the levers 23 will be rocked clockwise and the platen moved from its Fig. 2 toward its Fig. 3 position by the urge of springs 14 (Fig. 1) and by gravity. The initial movement of the platen causes the stud 36 to move away from the abutment nose 31 and allows the spring 34 to move the pressure rolls into engagement with the platen to grip the inserted work sheet. This occurs very quickly at the start of the movement of the platen and before such movement disturbs the position of the work sheet. The work sheet is thus gripped while the platen is in its raised or front-feed position and the papers are then carried with the platen as the latter moves to front-feed position.

In said copending application, the platen is latched in front-feed'position, and the throat in open position, by a latch 40 shown in dotted lines in Fig. 2, said latch hooking over a stud 4| on lever 23. The latch is released by a manually operated bell crank lever 42 having a cam edge 43 adapted to engage a stud 44 on latch 40 to release it. Lever v42 also has a cam slot 45 operating on a stud 46 on the lever 38 which carries the abutment nose 31. When the lever 42 is rocked counterclockwise the arm 38 with its abutment nose 3! is moved to release the arm 35 to permit the feed rolls to grip the work sheet.

Continued movement of lever 42 releases the latch 40 and allows the platen to move to printing position. The manually operated portion of the lever 42 has been shown in dotted lines in Fig. 2 as has also the platen latch 40 because neither of these parts is used in the present embodiment, shown in Figures 7,- 8, and 13 of the present application. But they have been illus-v trated because a portion of lever 42 is used in all of the embodiments of the present application and the parts shown in dotted lines also are used in the embodiments shown in Figures 4,-5,

and 6. I

Front-feed paper tableor chute I In order to guide a work sheet under the platen from the front and into the open frontfeed throat, a suitable paper table, or paper chute, is provided which is constructed, and which operates, as follows:

The table or chute has a flat, sheet-metal bottom SI and upstanding side edges 5|. These side edges are pivoted on a shaft 52 so that the chute can rock from a sheet-receiving position shown in Fig. 2 to a printing, or "sheet-hold- .in'g," position such as shown in Fig. 3.

When the parts are in the position of Fig. 2,

a record sheet R may be placed about the platen and held in position by the holding strips IS. A

work sheet W may then be placed on the paper chute I0, and guided under the platen from the by a Burroughs line finder which is well known and which has not been illustrated. The frontfeed throat is then closed to grip the inserted work sheet and the platen is moved to printing position.

As the front-feed throat is closed and as the platen moves to printing position, the platen shaft l0 engages a cam edge 53 on the lower part of the side edges 5| of the paper chute and cams the table from the position of Fig. 2 to that of Fig. 3, that is, from sheet-receiving to sheet-holding" or printing position. As the chute moves to this position it swings the unfed end of the work sheet W rearwardly about the platen, the lower edge 54 of the chute serving as a paper engaging or holding means that acts in i this capacity. The bottom plate till of the chute Power means for opening and c osing front-feed throat The front-feed throat may be automatically opened and closed, and the platenmay be automatically moved from printing to front-feed position and vice versa, by and under the control of a power means as will now be described.

Referring to Fig. l, the motor 8 that gives the machine cycles of operation'also drives, through the clutch 9, a shaft 60, the arrangement being such that, when the motor gives the machine a cycle of operation, the shaft is rotated one revolution in a clockwise direction (Fig. l).

Fixed to the shaft 60 is a snail cam 6i thatopcrates against a stud 62 carried by a lever 63 pivoted at 64 on a machine bracket. Connected to the forward end of lever 631s one end of a spring 64 whose other end is connected to a stationary arm 65. The'rear end of lever 63 is connected by a link 66 to a member 6? which is slidably mounted (Figs. 5 and 6) on a stationary plate 68 at the rear of the machine. 7

In the form of the invention shown in Figs. 5 and 6, the upper end of the slide til has an arm 10 pivoted thereto and urged counterclockwise by a spring H. The upper end of arm iii carries a roller stud 12 adapted to engage the underside of the ball 25 on the traveling paper carriage. The arm III is normally prevented from turning under the influence of spring by means of a latch 13 slidably mounted on slide 61 and urged upon and into engagement with a shoulder on arm 10 by means of spring 16.

Provision is made for latching the slide 61- in its lower position illustrated in Fig. 5-, and, for this purpose; a latch 15 is providedwhich is pivoted to the stationary back plate and urged clockwise by a spring Hi. The upper end of this latch carries a pivoted passby pawl 1'! adapted to be engaged by studs H0 and III on the bail 25. This latch normally engages in a notch 18 in slide 81 as shown in Fi 5.

Referring again to Fig. 1, the normal position of the cam 8| is as shown, with the low part of the cam immediatelybelow the stud 62. In Fig. l the parts are illustrated-in the position they lid occupy with the slide 61. latched against upward movement as shown in Fig. 5, which accounts for the fact that the stud $2 is not in engagement with the cam. It will be appreciated that, if the latch 15 (Fig. 5) is released, the slide 61 is free to move upwardly which it does under the urge of spring 64 (Fig. 1) which has been tensioned by the cam 6! as will be presently described. The latch 15 is released by the lateral movement of the traveling paper carriage and in order that the operation may be clear we will briefly explain the sequence of operations.

Assume that the machine is given a cycle of operation with the parts in the position of Fig. 1 except that the lever 63 is in a position such that the stud K52 contacts the low portion of the cam 63 as shown in dotted lines. As the machine is given a cycle of operation the cam Bl rotates clockwise. This cam is shaped 'so that it moves the lever G3 to the position of Fig. 1 after the cam has made less than ahalf revolution and. prior to the period in the cycle of operation of the machine in which the printing mechanism operates. In other words, during the initial portion of the machine cycle, the spring 64 is tensioned, the lever 63 is rocked counterclockwise, and the slide (it is drawn downwardly to the position of Fig. 5 where it may be latched by the latch 35. During the latter part of the cycle of machine operation the paper carriage is tabulated to its next columnar position and, assuming that there is a stud Mil positioned on the bail 225 so as to be operative during this movement, it will be clear that, during the latter part of a cycle oi machine operation, the latch 775 will be released, whereupon the slide (it will be moved upwardly by the spring M and the bail 25 pushed upward to move the platen from printing to front-feed position and to open the front-feed throat, where the bail 25 and the parts moved thereby are held by the latch ill engaging the stud ill until the latch ill is retracted from the stud ll by manipulation of finger piece 32.

In the form illustrated in Figs. 5 and 6. provision is made for disabling the effective connecti'on between the slide iii and the bail 25 after the slide has moved the bail upwardly to move the platen and open the throat. As previously explained, the arm id, which is pivoted on the upper end of slide 677 is urged counterclockwise by spring M and this arm is normally prevented from moving counterclockwise by a latch '13. This latch has a laterally projecting arm 8% adapted to engage a stud hi on the stationary plate (iii. Near the upper limit of the movement of the slide til the projection 8t] engages the stud ill and prevents the latch 713 from moving further with the slide (ill. This releases the arm ill whereupon the spring ll swings the arm counterclockwise out of engagement with the bail 25. This frees the bail for downward movement so that, if the platen is released, as, for example, by hand, it will be free to move to printing position without interference from the slide til and arm W.

The arm it is restored to its normal Fig. 5 position as the slide ti! is lowered. As the slide is lowered it pulls the arm 'lll downwardly and a stud 82 (Fig. 4) on the arm engages the inclined edges of a slot 83 in stationary plate lit (Fig. 4) and rocks the arm against the tension of the spring ll so that the parts are returned to the Fig. 5 position.

Thus it will be clear that the power for throwing back the platen and opening the front-feed throat is derived from the motor driving means during a machine cycle and independently of any traveling movement of the paper carriage. The power is applied somewhat indirectly by being momentarily stored in the spring mechanism. This indirect application is advantageous in that it gives a range of adjustment as to the time when the power may be applied. For example, the power is stored during the first part of the cycle and is then available for use at any time during the latter half of the cycle or after the cycle has ended.

It is to be noted that, in the operation just described, the platen is automatically moved to front-feed position and the front-feed throat is opened by power under control of the paper car-- riage. Provison is made, however, for both closing and opening the front-feed throat completely automatically and by power.

Automatically closing and opening the front-feed throat during a cycle of machine operation .the stud ill is active, the latch 15 will be released only momentarily because stud Hi passes quickly over the end of pawl all. The result is that, instead of allowing the slide 6? to move upwardly to the full extent of its movement, the latch 75 will enter the notch 85 and arrest the slide in an intermediate position such as shown in Fig. 6. This position is such that the' lateral lug til on the latch it has not yet engaged the stud til, and the pivoted arm it is not released but remains in engagement with the bail 25 (Fig. 6). The upward movement of the slide til, although only a partial upward movement, moves the bail 25 upwardly and moves the platen P away from its printing position. Also, the movement of the ball 23, 25 is not sufficient to enable the latch dd to engage above the stud ll to latch the parts in the position to which they have been moved.

It will be recalled that the tabulation oi the carriage occurs during the latter part of a cycle of machine operation. Accordingly, during the latter part of a cycle of machine. operation in which the carriage moves so that the stud ill becomes active, the platen will be automatically moved away from printing position although it will not be moved to the position heretofore described. As long as-the roller stud 72 on arm lit remains in engagement with the ball 25, the platen cannotbe returned even though it be released. But, during early part of the next cycle of machine operation, the slide til is returned downward to its normal position and hence the bail 25 is released to permit the platen to return to printing position.

This partial movement of the platen is not sufficient to open the front-feed throat in the manner heretofore explained, but provision is made for automatically opening the throat in the following manner.

As shown in Figs. 3 and 4, the paper carriage supports a bail till carried by arms 96 pivoted at 92 and urged clockwise, as viewed in Fig. 3, by a spring 9 3. The movement of the bail in a clockwise direction is normally limited by a stud 35 on a slide held in the position of Fig. 5 by a spring all, these parts being some of those used in connection with the skip tabulating mechanism described in Rinsche Patent 1,580,534.

Mounted on the bail SI which travels with the paper carriage is an adjustable cam 98 (Fig.

5) positioned so that, at the time the upper stud III releases the latch IS, the cam 98 engages the stud 95 on slide 9i, with the result that the bail 98 is cammed upwardly. This bail has an extension 99 at its right hand end as shown in Fig. 4 which is positioned under a vertically movable slide I best shown in Fig. 3. When the bail M is moved upwardly the slide I is also moved upwardly and a lateral lug IIII on the upper end or the slide moves into the path of a stud III2 on the upper end of an extension I03 o! the left hand teed roll arm 32, as viewed from the front of the machine, which arm carries the feed roll shaft SI. This movement of the parts occurs before the platen moves away from printing position. As the platen moves away from printing position, the feed roll shaft moves with it and because the arm I83 is blocked by the stud il2 engaging the lug IUI, the arms 32 are caused to turn counterclockwise which moves the feed rolls 30 away from the platen to open the front-feed throat.

When the platenmoves back to printing position the feed rolls 3!! are of course released to close the front-feed throat and the slide I00 moves back to normal as soon as the cam 98 passes the stud 95. v

With this construction, it will be understood that, when the paper carriage moves to a predetermined columnar position, the platen will be moved to an intermediate frontfeed position and the front-feed throat automatically opened.

The operator may then remove one work sheet and insert another, after which he may enter an item on the amount keys and give the machine a cycle of operation by depressing the motor bar. As the machine'operates, the cam 6| (Fig. 1) will, during the initial part of the cycle, move the lever 83 to draw the slide 81 downwardly to release the bail 25. This causes the front-reed throat to be automatically closed and the platen to be returned to printing position which action occurs prior to operation'of the printing mech- I anism during the cycle of machine operation.

In the operation just described the platen is moved to intermediate front-feed position and the throat opened during the latter part of one cycle of operation of the machine and then. during the first part of the next cycle, the throat is automatically closed and the platen returned to printing position. However, when a stud III! is positioned on the bail 25 as illustrated in Fig. 5, the front-feed throat may be automatically closed during the first half of a cycle of operation of the machine and then automatically opened during the latter half of the same cycle, or, in other words, the front-feed throat rn'ay be both opened and closed during a cycle :the latter half of this same machine cycle, the

carriage .will be tabulated to a new columnar pontion. During this movement of the carriage,

the stud I I0 becomes active to release the slide 81 whereupon the front-feed throat will be opened and the platen moved to front-feed position.

It is to be understood that the last-mentioned opening of the throat and movement of the platen could be to the intermediate" position if, instead of using a stud vI III, one of the studs III were located on the bail at the appropriate Closing and opening front-feed throat automati cally while carriage remains stationary Provision is also made for closing and opening the front-feed throat, and for moving the platen from printing to front-feed position and vice versa, with the carriage stationary.

Ordinarily, the paper carriage is tabulated during the latter part of eachcycle of machine operation and the carriage thus moves from column to column across the machine until it reaches its final column whereupon the carriage return mechanism may be set into operation by hand, or automatically, to return the carriage to a predetermined position. With the construction heretofore described, it is possible to close the throat automatically in any columnar position of the carriage and, either allow it to remain closed for the next column, or automatically open it for the next column, depending upon the arrangement of the stops III! and III.

It is sometimes desirable, however, to be able to both close and open the throat automatically during each machine cycle and provision has been made for quickly and easily converting the present mechanism into one that will operate in this manner.

While this closing and opening may take place during operations of the machine in which the carriage is tabulated, it is preferably done while the carriage remains stationary. The carriage may be held stationary by disabling the tabulating mechanism by depressing the carriage normal key 6 shown in Fig. 1. Or said tabulating mechanism may be automatically disabled when the carriage reaches a predetermined position as presently will appear.

Portions of the tabulating mechanism are illustrated in Figs. 10 and 11. Mounted in a stationary part of the machine is a tabulating abutment I20 having an abutment face I2I. The paper carriage carries a plurality 01 tab stops I22 which engage this abutment face in the different columnar positions of the carriage. These tab stops are carried by a rod I23 (Fig. l) which is rockable to enable the stops to be raised above the abutment face I2I. The spacing of the stops I22 on the rod I23 determines the columns at which the carriage will stop. The carriage is-released to move from one columnar position to another by swinging the rod I23 to free the active stop I 22 from the abutment. Mounted on the back plate of the machine is a slide I24 carrying a stud I25 engaged by a member I26 that is oscillated during each cycle of operation of the machine by a cam' I21 (Fig. 1). Pivoted on the slide I24 (Fig. 11) is pawl I2! whose upper end is adapted to engage under the tab stops I22. As the member I26 together with slide I2! is moved downwardly (Fig. 11) during the first part of a cycle of operation of the machine, the pawl I21 is moved downward to a position where it can engage under the tab stop I22 that is against the abutment I2I. Upon the return, or upward,.movement of the slide I21,

which takes place during the latter part of a cycle of machine operation, the pawl lifts the tab stop so that the carriage is free for movement to the next column under the influence of the usual carriage spring. As the carriage moves, the tab stop in moves off the top of the pawl lZ'l and the shaft l23 is rocked back to normal so that the next tab stop l2? can engage the abutment. As this stop moves to position, it engages the side edge of pawl l2ll and moves it clockwise as viewed in Fig. 11 until the stop brings up against the abutment face lZl. In this manner, the carriage is automatically tabulated from column to column during cycles of operation of the machine to cause printing to occur in different columns on the paper supported by the carriage.

This tabulating mechanism may be automatically disabled as follows: Referring to Fig. ll, a bell crank lever ltiil is pivoted on the abutment Hill at Hill, said lever being urged counterclockwise against a limit stud l 32 by a spring ldil. This bell crank has a lower arm adapted to engage a stud lll on the'pawl lZll. The bell crank also has an upper cam nose lilh adapted to contact the undersides of the tab stops l22. As one of the tab stops i322 moves to position against the abutment l2ll, its underside engages the cam nose l35 and rocks the lever l3d clockwise so that its lower arm is out of contact with the stud lil l, thus freeing the tabulating pawl ltl for normal operations.

A special tab stop N22 has been provided in one column. This stop is shown adjacent the abutment l2ll in Fig. ll. A normal tab stop l22 is shown to the right. This special tab stop is similar to the normal stops except that it is cut away at ltlti as illustrated in Figs. 10 and ll. When the special tab stop moves against the abutment 120, its lower surface is high enough so that it does not move the bell crank ldll with the result that the bell crank holds the pawl lzlll in the position of Fig. 11 where it is out from under the tab stop l22 and will not engage the latter to raise it as the machine is given a cycle of operation. The result is that in this column the carriage will remain stationary until it is released by some other means.

Release means has been provided under the control of the total key. Referring to Fig. 1 it will he observed that the total key 2' is carried by a hell crank l lll connected to a link l ll carrying a stud M3 adapted to engage one end of a pivoted lever M l. The other or rear end of this lever, contacts a lateral lug M5 on a bell crank lever M6 (Fig. 11) which is connected by a link l tl to a stud MB on the bell crank lelll. When the total key is depressed the bell crank llli is rocked clockwise as viewed in Fig. 11 and the link M7 is thrust to the left. This rocks the bell crank I30 clockwise and releases the pawl l2'l for normal movements. The result is that, if the total key is depressed and the machine is given a cycle of operation, the carriage will be tabulated to the next column near the end of the cycle of operation.

The number of special tab stops l22' used can be varied to suit the requirements and they can be located in any desired column or columns. In the embodiment shown, the special tab stop is located in the last column just before the carriage is to return. The result is that, when the total key is depressed, and the machine given a cycle of operation, the carriage moves slightly to the left and then is automatically returned by the automatic carriage return mechanism.

Referring now, to Fig. '7, it will be observed that the roller it, which engages the bail 25 in connection with opening and closing the front-feed throat, is carried by an integral extension of a slide l50 similar to the slide Ell heretofore described. There is no pivoted arm on the upper end of this slide. Instead the roller i2 is carried directly by the slide. The slide S'l shown in Figs. 1, 5 and 6 can also be used by fixing the arm "it securely to the slide so that the arm will not turn. A latch l5l is provided for this slide, said latch being pivoted at lid and urged clockwise by a spring ass.

The machinemay be converted into one that will close and open the front-feed means automatically during each machine cycle by disabling the latch ldl (Fig. '7). This is preferably accom plished by means of a finger piece ass that can be quickly and easily adjusted. Usually this is causes the frontL-feed throat to be closed. The

printing mechanism normally operates after the throat is closed. During the latter half of the cycle of machine operation, the high point of the cam @l (Fig. 1) moves past the stud t2 and releases the lever Since the lever is no longer latched by the latch ll'il the slide lEitl moves upwardly to open the front-feed throat and move the platen to front-feed position.

This automatic closing and opening will continue to take place during each machine cycle until the finger piece ltd is again moved to release the latch l5l. Accordingly, during each machine cycle, and preferably with the carriage remaining stationary, the front-feed means may be moved from closed to open throat condition and vice versa during each cycle of machine operation and independently of any other manual or automatic control of the latch l5l.

Completely automatic control of closing and opening front-feed throat in predetermined columns the operating slide lSG does not have a pivoted arm on its end. The adjustment of the tab stop I122 relative to the stud l II] for tripping the latch l5l that holds the slide I50 is such that the stud llfl does not pass the latch when the carriage reaches the predetermined columnar position. Assume that the carriage reaches this predeter mined-columnar position and that a stud lld contacts the pawl carried by latch Hi and r leases the slide I50. As the slide I50 moves up 75 the side edge of the slide I50.

downwardly and the bail 25 follows it. As the bail moves downwardly the stud IIO comes down with it and engages the pawl to retain the latch I5I in released'position. The relative adjustment between the tab stop I22 and stud 0 must be such that the vertical line of movement of the center of the stud H0 is sufliciently to the side of the pawl so that when the bail descends and the stud H0 comes down itwill engage the pawl to retain the latch in released position. The above operation having taken place during the first half of the cycle, the slide I50 is not latched by the latch I5I and the slide is free to move" upward again. Nevertheless, it does not move upward immediately to open the throat because it cannot move until the high point of the snail cam 6! (Fig. 1) has passed the roller stud 62. This does not occur until after the printing mechanism has operated but when it does occur the slide I50 moves-upwardly again to open the throat.

The above adjustment of the parts is not a fine adjustment. The above operation is obtainable throughout a substantial range of adjustments. In order to extendthis range the pawl may be contructed-as illustrated by the pawl I60 in Figure 8 when it is known that this type of carriage control iswanted. Referring to Fig. 8, the special pawl I60 is mounted on the upper, end of the latch I54. This pawl has an inclined cam surface I6I. The stud IIO that is used to obtain the control is made so that it can be enabled and disabled and it is numbered I62 in Figs. 8 and 9. It is mounted in the bail 25 so that it can be moved into and out of active position by finger pressure applied in one direction or the other, the stud'being held in either of its positions by a spring clip or detent I65 (Fig. 9). This enables this particular automatic control by the carriage to be enabled or disabled quite easily.

The operation of the stud I62 and the pawl I60 is as above described. When the carriage moves into a position where the stud I62 contacts the pawl I60, the latch I5I is moved, whereupon the slide I50 moves upward. As it moves upward the ball 25 moves upward and the stud I62 moves with it. During the first half of the next machine cycle the slide I50 is pulled down, whereupon the ball 25 with the stud I62 moves downward. The stud contacts the cam edge l6l of the pawl I60 and maintains the latch I5I in released position so that the carriagewill again open during the latter half of the machine cycle. The provision of the long cam surface IS! on the pawl I60 enables a rough adjustment to be made as between the tab stop I22 and the stud I62, because the vertical line of movement of the stud I62 can vary as long as it is such that the stud I62 will contact some part of the fairly long inclined cam surface I6I of pawl I60.

The front-feed throat is thus automatically closed and automatically opened during a single cycle of machine operation with the carriage stationary. The operator need pay no attention to setting a manipulative member such as the detent I54 heretofore explained.

With this form of the invention, when the total key is depressed, the condition of the machine latch I82. and the slide moves upwardly' under the influis changed. Depression of the total key enables the tabulating mechanism and when the carriage moves from the column 'where it has been, the latch I5I moves back to latching position. As shown, the total key is operative as described when the carriage is in its last column. Accordingly, when the total key is depressed and the machine given a cycle of operation, the carriage moves slightly to the left during the latter part of the cycle and it is then returned automatically to the right by the carriage return mechanism.

One of the studs I62 can, of course, be used when the tabulating mechanism is in tabulating condition. In such event, bail 25 is released at about the time the carriage is tabulating from one column to another, or during the carriage movement. This speeds up the opening of the front-feed throat and the movement of the platen to front-feed position.

In another form of the invention, the operator,

at his option, can cause the front-feed throat to be automatically closed and then automatically opened during any cycle of machine operation and with the carriage stationary in any column that he chooses. ing of the throat is independent of the carriage.

Referring to Fig. 12, the machine is provided with a special motor bar I10 overlapping the regular motor bar. The stem H! of the special motor bar is connected to one arm I12 of a pivoted bell crank lever whose other arm I13 carries a. stud I14 bearing against an arm I15 fixed to a shaft I16. Fixed to this shaft is another arm I11 which is connected by a link I18 to a slide I19 shown best in Fig. 13. The upper end of slide I19 carries a passby pawl I60 adapted to engage a stud I8I on a latch I82 pivoted at I83 and urged'clockwise by a spring I84. This latch engages a shoulder I85 of a striking hammer I86 urged clockwise, as viewed in Fig. 13, by a spring I81v said striking member having a lug I88 adapted to engage the upper end of the latch I5I. v

.,When the special motor bar I10 is depressed, the regular motor bar is depressed and the machine given a cycle of operation. These two motor bars are latched down during the cycle by a latch I10 (Fig. 12) but are released near the end of the cycle of machine operation. As the motor bar I10 moves downward, it rocks bell crank l12-I13 and the connections I15. I16, I11, I18 move slide I19 downwardly. During this movement, the passby pawl I80 has no effect on the But, when the motor bar is released,

ence of a spring I89, the passby pawl rocks the latch I82 counterclockwise to release the hammcr I86 which is thereupon fired against the latch I5I to release the latter. Release of latch I5I' allows the slide I50 to move upwardly to move the platen from printing to front-feed position and to open the front-feed throat.

The hammer I86- is returned to normal by the upward movement of the slide I50. This slide carries a stud I90 adapted to engage'the cam edge I9I of one arm of a bell crank I92 pivoted to the stationary plate 68. The other arm of this bell crank has a slot I93 engaging over a slide I50 moves upward the bell crank I92 is In fact, the opening and closrocked counterclockwise which rocks the firing 7 llli member I86 back to normal position where it is latched by the latch 682.

Assume that the carriage is in any column with the throat open and that the operator de presses the special motor bar Wit. During the first part of the cycle of machine operation, the slide H50 is lowered and latched, which causes the throat to automatically close. After printing occurs, and during the latter part of the cycle of machine operation, the hammer H86 strikes the latch 850 to release it, whereupon the slide 85!! is-automatically raised to open the throat. I

The special motor bar can be depressed While the tabulating mechanism is operative, in which event the opening of the throat occurs just before or during the carriage tabulation to the next column. The throat is thus opened after the printing mechanism has operated and before the carriage reaches its next column so that a fast operator can talre out a Work sheet while the carriage is moving to its next position.

Provision is made, however, for having depres sion of the special motor bar ilii also disable the tabulating mechanism. Positioned under the arm N3 of hell cranlr llI2-lll3 (Fig. 12) is a stud 20.0 on a slide 28!] which is urged upward by a spring 202. The rear end of this slide has a stud 203 which operates in a cam slot 2M (Fig. 11) of a lever 295 pivoted at 2% tothe machine back plate. Connected to lever 2% is a slide Ztl'l which extends to the right in Fig. 11 to a position adjacent the tabulating mechanism. The right-hand end of this slide has a forked end extending over stud 113i and a downwardly extending arm [198 which is adapted to engage the pawl flZZ'Il.

The arrangement is such that, when the special motor bar no is depressed, the slide 2M (Fig. 12)

is moved downward and this moves the slide 2831 (Fig. 11) to the right. This moves the pawl m out-of the path of the tab stop H22 which is in position at the time so that, when the machine is given a cycle of operation, the carriage is not tabulated but remains stationaiy.

The stud 200 is removable and, when it is desired to not have the tabulating mechanism disabled by the special motor bar, the stud is removed.

From the above, it will be clear that by depressing the special motor bar it the operator can cause a-cycle of operation of the machine in which the carriage remains stationary and in which the front-feed throat is automatically closed and then automatically opened during said cycle of machine operation. The operator thus has the option of choosing the column in which the throat is to be automatically closed and opened.

If the motor bar should be depressed in a column where the throat is closed and the platen is in printing position, the result will be an automatic opening of the throat and an automatic movement of the platen to front-feed position near the end of the cycle of machine operation. In other words, there will be an automatic opening of the parts without'a closing and this can take place with the tabulating mechanism op erative or inoperative.

It is to be understood that the structure shown is for purposes of illustration only and that modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

aaoateo I claim:

1. A calculating machine having means for giving it cycles of operation, a printing mechanism, a platen normally occupying a printing position. relative to said printing mechanism but movable therefrom to an out-of-printing position, power means for moving said platen to its out-of-printing position, a traveling paper carriage normally movable from column to column during cycles of operation of said machine, and means conditionable by a single manipulative member and operable in any columnar position of said carriage to cause said carriage to remain stationary during the next cycle of machine operation and to condition said power means independently of the position of said carriage to cause it to automatically move the platen to out-of-printing position near the end of said next cycle of machine operation,

2. A front-feed machine of the class described having means for giving it cycles of operation, a printing mechanism, a platen, paper supporting means, a column printing control means for causing printing to occur in different columns on the paper supported by said supporting -means, front-feed means or enabling a work sheet to be front-fed relative to said platen and for holding said sheet in printing position, said front-feed means being movable from a closed to an open-throat position and vice versa, power means for moving said front-teed means to open-throat position, and means conditionable by a manipulative member, with said column printing control means conditioned for printing in any column, for disabling said column printing control means and, independently of said column printing control means, to condition saidcolumn to column across the machine during cy-' cles of machine operation, a platen, front-feed means for enabling a work sheet to be front-fed relative to said platen and for holding said sheet in printing position, said front-feed means being movable from a closed to an open-throat position and vice versa, power means for moving said front-feed means to open-throat position, and means conditionable by a manipulative member and operable in any columnar position of said carriage to cause said carriage to remain stationary during the next cycle of machine operation and independently of said carriage to condition said power means to cause it to automatically move said front-feed means to open-throat position near the end of said next cycle of machine operation and while said carriage remains stationary.

4. A front-feed calculating machine having means for giving it cycles of operation, a printing mechanism normally operated at a predetermined time during a machine cycle, a platen normally occupying a printing position. relative to said printing mechanism but movable away therefrom to a front-feed position to facilitate the removal and insertion of work sheets, power means normally operating during a machine cycie initiated with said platen in frontfeed position, to cause said platen to be moved to printing position but not to be returned to front-feed position, and manipulative means for platen to front-feed position after said printing mechanism has operated. I

5. A front-feed calculating machine of the class described having means for giving it cycles of operation, a printing mechanism normally operated at a predetermined time during a machine cycle, a platen normally occupying a printing position relative to said printing mechanism but movable away therefrom to a front-feed position to facilitate the removal and insertion of work sheets, power means normally operating, during a machine cycle initiated with said platen in front-feed position, to cause said platen to be moved to printing position but not to be returned to front-feed position, selective control means for causing said power means to move said platen to front-feed position at selected times, and means other than said selective. control means for readily conditioning said power means to cause it, during each subsequent machine cycle and irrespective of said selective control means, to 'move said platen from frontfeed to printing position prior to operation of said printing mechanism and to return said platen to front-feed position after said printing mechanism has operated.

6. A front-feed calculating machine of the class described having means for giving it cycles of operation, a printing mechanism normally operated at a predetermined time during a machine cycle,'a platen, front-feed means for receiving and holding a work sheet in front-fed position relative to said platen, said front-feed means being movable from closed to open-throat condition and vice versa, power means normally operating, during a machine cycle initiated with said front-feed means in open-throat condition, to cause said front-feed means to be moved to closed throat condition but not to be returned to open-throat condition, and manipulative means for readily conditioning said power means to cause it, during each subsequent machine cy cle without further manipulation of said manipulative means, to move said front-feed means from open to closed-throat condition prior to operation of said printing mechanism and to return it to open-throat condition after said printing mechanism has operated.

7. A front-feed calculating machine of the class described having means for giving it cycles of operation, a printing mechanism normally operated at a predetermined time during a' machine cycle, a platen, front-feed means for receiving and holding a work sheet in front-red position relative to said platen, said front-feed means being movable, from a closed-throat to an open-throat condition and vice versa, power means normally operating, during a machine cause said front-feed means to move from open to closed-throat position prior to operation of said printing mechanism and to be returned to open-throat condition after said printing mechanism has operated.

8. A front-feed calculating machine of the class described having means for giving it cycles of operation, a printing mechanism normally operated at a predetermined time during a machine cycle, a traveling paper carriage support ing a platen, front-feed means for enabling a work sheet to be front-fed relative to said platen and for holding said sheet in front-fed position, said front-feed means being movable from 'a closed to an open-throat condition and vice versa .but normally being in closed-throat condition,

power means for moving said front-feed means, said power means normally being ineffective to move said front-feed means, and manipulative control means operable irrespective of the position of said carriage to initiate a machine cycle and to condition said power means to move said front feed means to open-throat position during said machine cycle irrespective of the position of said carriage.

9. A front-feed calculating machine of the class described having means for giving it cycles of operation, a printing mechanism normally operated at a predetermined time during a machine cycle, a traveling paper carriage supporting a platen, front-feed means for receiving and holding a work sheet in front-fed position relative to said platen, said front-feed means being movable from a closed to an open-throat condition and vice versa but normally being in closed-throat condition, power means for moving said frontfeed means, said power means normally being ineffective to move said front-feed means, and manipulative control means for conditioning said power means to enable it, during the next machine cycle, which cycle is initiated while' said front-feed throat is open and occurring while said carriage remains in the columnar position where said throat is open, automatically to move said front-feed means to closed-throat condition prior to operation of said printing mechanism and automatically to move said front-feed means to open-throat condition after said printing mechanism has operated. 10. A front-feed machine of the class described having means for giving it cycles of operation, a printing mechanism normally operated at a predetermined time during the machine cycle, a traveling paper carriage supporting a platen, said carriage normally being movable from one column to another during a machine cycle but beingcapable of being held stationary,

front-feed means for receiving and holding a work sheet in front-fed position relative to the platen, said front-feed means being movable from a closed to an open-throat condition and' vice versa but normally being in closed-throat condition, power means for moving said frontfeed means, said power means normally being ineffective to move. said front-feed means, and

manipulative control means for causing said paper. carriage to remain stationary during a machine cycle and for conditioning said power" means to enable it to operate during a cycle of machine operation initiated with said fi'ont-feed throat open and while said carriage remains stationary, automatically to close said front-feed throat prior tooperation of said printing mechanism and automatically to open said throat after said printing mechanism has operated,

Kill

= 11. A front-teed machine of the class de scribed having means for giving it cycles of opmeans normally being inefiective for moving said.

platen, a device normally movable during each machine cycle, control means for said power means automatically governed by said movable device to cause said platen to be moved to frontieed position, and manipulative means operable at the option of the operator for conditioning said power means, independently or said automatic control, to enable said power means, during the ensuing machine cycle initiated with said platen in front-iced position, to cause said platen automatically to be moved to printing position prior to operation of the printing mechanism and to be returned to front-iced position after said printing mechanism has operated.

12. A front-teed machine oi the class described having means for giving it cycles of operation, a printing mechanism normally operated at a predetermined time during a machine cycle, a traveling paper carriage supporting a platen normally occupying a printing position relative to said printing mechanism but movable away therefrom to a front-feed position to facilitate the removal and insertion of work sheets, power means for moving said platen, said power means normally being ineffective to move said platen, and manipulative means operable at the option of the operator to condition said power means independently of any movement of, or position of, said carriage to enable said power means to operate, during the ensuing machine cycle initiated while said platen is in front-feed position, to cause said platen to be moved to printing position prior to operation oi said printing mechanism and to be returned to front-teed position after said printing mechanism has operated.

13. A front-feed calculating machine of the class described having means for giving it cycles oi operation, a printing mechanism normally operated at a predetermined time during a machine cycle, a platen, front-feed means for receiving and holding a work sheet in front-fed position relative to said platen, said front-feed means being movable from a closed to an open-throat condition and vice versa, power means for moving said front-feed means, said power means normally being ineffective to move said frontieed means, a device normally moved during each machine cycle, means controlled by said movable device for automatically controlling said power means to move said front-feed means to open-throat condition, and a manipulative means operable at the option of the operator to condition said power means, independently of said.

movable device control, to cause said power means to operate, during the ensuing machine cycle initiated while said front-feed means is in open-throat condition, to move said front-feed means to closed-throat condition prior to operation of said printing mechanism and to return it to open-throat condition after said printing mechanism has operated.

it. A front-feed machine of the class described having amotor driving means for giving it cycles of operation, a printing mechanism normally op= erated at a predetermined time during a machine cycle, a traveling paper carriage supporting a platen, front-feed means for receiving and holding a work sheet in front-fed position relative to said platen, said front-feed means being movable from a closed to an open-throat condition and vice versa, power means for moving said frontfeed means, said power means normally being ineffective to move said frontdeed means, and manipulative means operable at the option oi the operator independently of any movement of, or position of, said carriage for conditioning said power means to enable it, during the ensuing machine cycle initiated while said front-feed means is in open-throat condition, to move said front-feed means to closed-throat condition prior to operation of said printing mechanism and to return it to open-throat condition after said printing mechanism has operated.

15. A front-reed calculating machine of the class described having motor driving means for giving it cycles of operation, a printing mechanism normally operated at a predetermined time during a machine cycle, a traveling paper car riage supporting a platen, said carriage normally moving from one column to another during each machine cycle but being capable of being held stationary, front-feed means for receiving and holding a work sheet in front-fed position rela-' tive to said platen, said iront-ieedmeans being movable from a closed to an open-throat conclition and vice versa, power means for moving said front-feed means, said power means normally being ineffective to move said front-feed means,

and manipulative means operable at the option of the operator while said throat is open to cause a cycle of machine operation, to cause said car riage to remain stationary, and to condition said power means to enable it to operate to cause said front-feed means automatically to be moved to closed-throat condition prior to operation of said printing mechanism and to be returned to openthroat condition after said printing mechanism has operated.

ROBERT L. I! 

